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  2. May 17, 2021 · The Germans were the first to use phosgene in battle, but the Allies made it their primary chemical weapon later in the war. Mustard gas was an entirely new kind of killer chemical.

    • Dave Roos
    • 3 min
  3. The widespread use of these agents of chemical warfare, and wartime advances in the composition of high explosives, gave rise to an occasionally expressed view of World War I as "the chemist's war" and also the era where weapons of mass destruction were created.

  4. In modern warfare, chemical weapons were first used in World War I (1914–18), during which gas warfare inflicted more than one million of the casualties suffered by combatants in that conflict and killed an estimated 90,000.

    • Barry R. Schneider
  5. The horrors of gas warfare caused public indignation, both during and after World War I. In 1925 a Geneva convention was signed outlawing the use of chemical weapons. Adolf Hitler, who had himself been a victim of mustard gas in 1918, indignantly refused to deploy poison gas during World War II.

  6. Apr 6, 2017 · One hundred years ago today (April 6), the United States declared war on Germany and entered into World War I (WWI), the global conflict that initiated the first widespread use of chemical...

  7. Gas warfare is a method of war that employs weapons that are designed to cause casualties primarily through the use of harmful chemical agents. The First World War constitutes the most extensive incidence of gas warfare in the 20th century, and poison gas remains associated with the horrors of trench warfare in public memory.

  8. Learn about the development of chemical warfare during World War I. © American Chemical Society (A Britannica Publishing Partner) The horrifying history of gas warfare. Examine how the Allied powers dismembered the Central Powers of World War I by a treaty that failed to prevent World War II.

    • 5 min
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